Description: This function defines curves for trimming edges and/or cutting holes on the selected surface. The defined curves may be poly-lines, b-spline lines, circles, piecewise linear segments, or intersecting lines of two surfaces.
Usage:
1. DSI prompts for a surface:
> SELECT SURFACE FOR TRIM OPERATION
2. Upon selection of the surface, DSI prompts:
> SELECT POINT ON SURFACE FOR TRIM LINE
Description: This function cuts circles on a selected surface. The user defines the location of the circle via mouse pick.
Usage:
1. DSI prompts:
> SELECT THE CENTER OF THE CIRCLE
• The user defines the center of the circle anywhere on the surface.
> SELECT A POINT ON THE CIRCLE
• The user may select a second point on the surface to define the radius of the circle. DSI proceeds to draw the circle.
2. The user should then select exit. DSI prompts:
> SELECT A CLOSED CURVE AS OUTER BOUNDARY
? ABORT
SURFACE BOUNDARY
• Selects the outer, closed, surface boundary.
CURVE ON SURFACE
• The user may select an existing curve on the surface (open or closed) as the outer boundary of the trim operation.
REJECT LAST CURVE
• Deselects the curve selected for the trim operation.
DONE
EXIT
3. DSI prompts:
> SELECT CLOSED CURVE AS INNER BOUNDARY
? ABORT
CURVE ON SURFACE
• The user may select an existing curve on the surface (open or closed) as the inner boundary of the trim circle operation.
NO INNER BOUNDARY
• DSI trims the surface of the outer boundary.
REJECT LAST CURVE
DONE
EXIT
4. DSI then prompts:
> DELETE THE ORIGINAL SURFACE. (Y/N)
• YES generates a trimmed surface.
NO generates a trimmed surface and retains a copy of the original surface.
5. The user is returned to step 1 of TRIM SURFACE command.
Description: This function allows the user to trim away the intersection of two surfaces.
Usage:
1. DSI prompts:
> SELECT SURFACE FOR TRIM OPERATION
Note: This surface is referred to as a "primary surface" in this section.
> SELECT THE SECOND SURFACE
• Once the user selects the second surface, DSI draws a boundary line between the two intersecting surfaces.
Note: This surface is referred to as a "secondary surface" in this section.
2. Once the second surface has been selected and the user enters EXIT, DSI prompts:
> SELECT A CLOSED CURVE AS OUTER BOUNDARY
? ABORT
DONE
EXIT
SURFACE BOUNDARY
• This creates the outer closed-surface boundary.
CURVE ON SURFACE
• This locates an existing curve on the surface (open or closed) as the outer boundary of the trim operation.
REJECT LAST CURVE
• This rejects the last curve selected for the trim operation.
3. DSI prompts:
> SELECT CLOSED CURVE AS INNER BOUNDARY
• This retains the surface between the outer boundary and the inner boundary during the trim operation. The inner boundary can be a line segment, open spline, closed spline, or circle.
• ABORT
DONE
EXIT
NO INNER BOUNDARY
• This trims the outside surface of the outer boundary.
CURVE ON SURFACE
• The user may select an existing curve on the surface (open or closed) as the inner boundary of the trim operation.
REJECT LAST CURVE
• This rejects the last curve selected for the trim operation.
4. DSI then prompts:
> DELETE THE ORIGINAL SURFACE. (Y/N)
• YES generates a trimmed surface.
NO generates a trimmed surface and retains the original surface.
5. DSI returns the user to step 2 of the TRIM SURFACE command.
Description: This function defines an open curve on a selected surface. After determining the surface, type of curve, and points, this function connects the points leaving the curve open, with the first and last point selected as the starting and ending points of the curve.
Description: POINT is the default option in the trim surface menu. Users may pick locations on the surface defining piecewise linear segments for trim operations.
Description: This function cuts spline curves on a selected surface. The user defines the location of the spline via mouse pick.
Usage:
1. DSI prompts:
> SELECT NEXT POINT FOR SPLINE CURVE.
• Once the user has selected the points for the curve, then enters DONE
(CLOSED), or enters OPEN CURVE to complete the spline.
• DONE (CLOSED) defines a closed spline curve passing through all the points selected.
• OPEN CURVE defines a spline curve passing through all the
points selected, with the first and last point selected as the starting and ending points of the curve. The user then selects exit twice.
2. DSI prompts:
> SELECT A CLOSED CURVE AS OUTER BOUNDARY
• ABORT
DONE
EXIT
SURFACE BOUNDARY
• Selects the outer closed surface boundary.
CURVE ON SURFACE
• The user may select an existing curve on the surface (open or closed) as the outer boundary of the trim operation.
REJECT LAST CURVE
3. DSI prompts:
> SELECT CLOSED CURVE AS INNER BOUNDARY
• The surface between the outer boundary and the inner boundary will be retained during the trim operation. The inner boundary can be a line segment, open spline, closed spline, or circle.
? ABORT
DONE
EXIT
NO INNER BOUNDARY
• The surface outside of the outer boundary will be trimmed.
CURVE ON SURFACE
• The user may select an existing curve on the surface (open or closed) as the inner boundary of the trim operation.
REJECT LAST CURVE
• Deselects the curve selected for the trim operation.
4. DSI then prompts:
> DELETE THE ORIGINAL SURFACE. (Y/N)
• YES generates a trimmed surface.
• NO generates a trimmed surface and retains the original surface.
5. The user is returned to step 2 of TRIM SURFACE command.
Description: This function deselects points when defining a trim line.
Description: This function defines a closed curve on a selected surface. After determining the surface, type of curve, and points, this function connects the points, closing the curve with the first and last points selected linked.